Electrical heating unit.



L..G.' CQPEMAN. ELECTRICAL HEATING UNIT. APPLICATION VFILED'IANl 2,3. 19m.

Patent-ed May-11, 1915.

ma( I A TTUR/VE Y S annesse.

entran arianne rar p LLOYD GROEF COPEMAN, F FLINT, MICHIGAN, ASSIGNOR T0 COPEMAN ELECTBC STOVE COMPANY, OF FLN'l, MCHIGAN, A CORPORATION 0F MICHIGAN.

urincrnronn Hnslrrno unir.

Specification of Letters Patent.

Patented May iiltlt..

.application inea January as, 1912i.Y serias No. claas/i.

To all whom it may concern:

Be' it known that l, llanero Geom? Corn- MAN, a citizen of the United States of America, residing at Flint, in the county of Genesee and State ot Michigan, have invented certain new and useful improvements in Electrical Heating Units, of which the following is a specification, reference being had therein -to the accompanying drawings.

The invention relates to electrical heating units particularly designed 'for use inl cook ing operations, and it is the primary object of the invention to obtain a flexible construction, or one in which the intensity and distribution of the heat may be varied according to the requirements. p

ln the drawings: Figure l is a perspective view-of the unit complete; Fig. 2 is a plan View of the insulator holder tor the resistor; Fig. 3 is a sectional side elevation there-ot;

and Fig. l is an enlarged section showing the retaining means for the resistor.

ln performing cooking operations with electric heat it is desirable to vary the intensity, and to this end various constructions have been devised.v lt is, however, also desirable at times to vary the distribution oi the heat., without changing either its intensity or quantity. For instance,'it a large cooking utensil is used, a small t uantity of heat may be all that is necessary ror performing the operation, and yet iii this is concentrated at the center of the utensil it may result in burning. On the other hand, if the saine quantity of heat is l distributed about the margin o1 the vessel it will perform the cooking without overheating.

With the present invention i have de-= viseda construction in which the quantity, intensity and distribution of the heat may be variously adjusted and-used to the greatest advantage in cooking operations. More speciicalllhave devised a construction in heat resistor, included in separate electric circuits, are arranged concentrically and are 'adapted for either alternative or simultaneous operation.

As shown, Ayis a suitable stand or sup. porting frame; B is an insulator heat-dis trihuting hcdy,land C C and C2 are several sections or the resistor arranged in multiply circuit. All of these sections are`preferahly arranged in grooves in the insulator body B and, as shown, a continuous spiral groove contains all three sections. The section C extends from the center outward, the section C2 is adjacent to the periphery and the section C is intermediate the sections-1C and C2. The electrical resistance ot these respec` tive sections is preferably equal, so that there will be the same heat generation with any one of the sections, but with. varying eect, due to difference in distribution. l'For controlling the circuits,` each is preferably .provided with an independent switch, and

these switches D D and D2 may he mounted upon the stand A, as shown.- lthere are also' provided terminal contacts 'E and E for connection with the external circuit.

With the construction as described., in

where a coolnng utensil 1s used,

operation, the bottom ot which is equal in diameter to the body B, the operator may produce varying effects by the alternative use of the several resistor sections. heat at one point is desired, `the central secn tion C is employed, iorthis has all of its length concentrated in the smallest area.

lf, on the other hand, itis merely desired to Y maintain a low heat in theentire vessel, the outer section C2 is placed in circuit and the heat generated will be distributed with lesser intensity at any onepoint. An in termediate ed'ect may he obtained by placp ing in circuit the resistor section C, while still other effects are obtained by operating any two or all three of the sections in unison.

In addition to obtaining the varied ei?- fects as above described, my construction is capable of obtaining the same eiects as with alternate series and multiple connections of resistor elements, or by the use of an eX ternal rheostat; but the 'construction is very much simplified by dispensing with such arrangements. Y y

`The resistor is preferably Wound in spiral forni and the spiral winding then introduced into the spiral groove, as shown. To retain the resistor in this position inwardlyafro jecting lugs F are preferably arranged at intervals along the' spiral groove, and which,

as shown in Fig. tu prevent accidental disn placement of the resistor from the groove.

What l claim as my invention is: 1. An electrical heating unit, compris'hrig llt intensity of I ice anjeleotrieal insulating, heat-distributing @body having a groove inone face thereof, separate overhanging projections extending from the sides of said groove, and a coiled resistor Within said groove and engagealole with said overhanging projections.

2. An electrical heating unit, comprising an electrical insulating, heat-distributing body having a groove in one face thereof, inwardly-projecting lugs arranged at intervals along said groove, and a coiled resister Within said groove and engageable with said lugs.

3. An electrical heating unit, comprising an electrical insulating, heatdistributing body having a spiral groove in one face thereof, overhanging projections extending from the sides of said groove in a radial line from the center of said body, and a coiled 'resistor Wound spiralljy Within said mesme groove and engagealole with said overhanging projections.

4. An electrical heating unit, eomorisinff an electrical insulating, heat-d body having a spiral groove in, one thereof, inwardly-projecting lugs arrar at intervals along said grooveywt resistor wound spirally Within said groove and gaging said lugs, said resistor being divided into a `pluralityoii sections concentric with and surrounding one another, and nieans for closing circuit alternatively through. saidsections.

ln testimony7 whereof l aiia my signature in presence of two Witnesses.

LLYE Glitll? JPM "it,

llVit-nesses ltov W'. Sommaire, Esami Semrrma. 

